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d in (-oo:+oo)
6*d-7*d+4/5 = 19/55 // - 19/55
6*d-7*d+4/5-(19/55) = 0
6*d-7*d+4/5-19/55 = 0
5/11-d = 0 // - 5/11
-d = -5/11 // * -1
d = 5/11
d = 5/11
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